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Sony 36" TV weird problems.

Discussion in 'Electronic Repair' started by Dani, Feb 23, 2007.

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  1. Dani

    Dani Guest

    Model # KV36FV15. Unit has no raster, or audio, has a low "white
    noise" in the speakers, but has filiaments, & 30 KV high voltage. Turn
    up G 2 gives no vertical, not quite enough horizontal
    width, sometimes the lower half of the picture has raster, & retrace
    lines, & bad pincushion correction. I removed the rear vertically
    mounted A/V board, looking for bad connections, as it is
    a common fault. B + is 135 volts, & I have 22, -15, & 15 volts. The
    front buttons don't work, but
    unit comes on with a remote. Even with the remote, I can't get input
    access, or select vloume, channel etc. Led flashes continuously, no
    code.I read somewhere something about the data & clock lines, but it's
    really a stumper. Anyone see this very odd problem before? Thanks,
  2. Colin

    Colin Guest

    One voltage you haven't mentioned is 5 volts. There is a good chance this is
    not reaching certain places that it should. If this is missing it will also
    upset the clock/data operation.

    Assuming all is ok with the above,
    Scope the field ramp waveform and if correct check the DC conditions around
    the field output stage. If all correct try changing the field output IC.
    If the ramp waveform is not right you need to investigate around the
    timebase generator.
  3. Guest

    I have seen these symtoms caused by a bad IC that contained the
    blanking circuits,video etc,it also
    had some bad filters connected to it
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